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<h1>pde
&nbsp;&nbsp;<img src="../mex.png" alt="Linux PC" border="0" title="Linux PC"></h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>Finite phase difference and Kay frequency estimation</strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Finite phase difference and Kay frequency estimation

 Estimates the instantaneous frequency of the input signal using
 General Phase Difference (FFD, CFD, 4th, 6th) and Kay Frequency
 Estimation

 Usage:

     ife = pde( signal, order [, window_length]);

 Inputs

    signal

      Input one dimensional signal to be analysed.

    order

      Order of the finite phase difference estimator. Available
      estimator orders are: 1, 2, 4, 6.

    window_length

      Kay smoothing window length in the case of weighted phase
      difference estimator.  NB Set order = 1 for Kay's method.


     For General Phase    Difference:

     window_length:0;
     order:1, 2, 4 or 6;

     e.g. ife = pde( signal, order);

     for Kay smoothing weighted phase difference:

     window_length: desired window length;
     order=1;

     e.g. ife = pde( signal, 0, window_length );</pre></div>

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